Derby will hand Nick Blackman a debut against his old club when the Championship resumes on Tuesday following FA Cup action.
The Rams, winners of Hartlepool 2-1 and second in the Championship, signed the in-form forward from rivals Reading for £2.5m on a three-and-a-half-year deal.
The 26-year-old, whose Royals contract was due to expire in the summer, has scored 13 goals in 28 games this term and made his full debut for the club in the clash with Hartlepool.
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Its baiter blow for Reading, with Brian McDermott telling the BBC:
Nick and I had a chat about where best to play him to get the most out of his game,” said McDermott. “Derby then came calling and that’s where the discussion ended.
The issue was Nick had only six months left on his contract. He was in demand, people were making offers and a fee was agreed,” he said.
“You’re always disappointed when you lose someone that scores goals. But the group has always got to be stronger than the individual and that’s what I’m focusing on@
Abdoul Camara, another winter signing, also made his debut in the cup game and both players will hope to be involved on Tuesday.
Derby are four points behind leaders Middlesbrough and lost to the league’s top side last time out, going down 2-0. The defeat followed a 2-2 draw with Leeds United meaning that the Rams have yet to win in the league since the 2-0 win over Fulham on Boxing Day.
However the league’s top scorers and second best defence will be confident of getting back to winning ways especially with a much changed side progressing in the cup.
Reading are currently 12th in the table and under the management of previous boss, Brian McDermott.
The former Arsenal midfielder has won two and lost two of this first four league games and draw 2-2 away to Huddersfield in the FA cup on Saturday.
The Royals have won two of the last three meetings between the sides, winning 3-0 at iPro Stadium last May, three months after they won 2-1 in the FA cup.
The Rams last won at home against Reading in 2009 when they triumphed 2-1 although they also won 2-0 in a league cup tie in 2014.
Paul Clements side have won both of their last two trips to Berkshire and won 1-0 at the Madejski earlier in the season.